2123779481 has 2 divisors, whose sum is σ = 2123779482. Its totient is φ = 2123779480.

The previous prime is 2123779457. The next prime is 2123779507. The reversal of 2123779481 is 1849773212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1161787225 + 961992256 = 34085^2 + 31016^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123779481 - 2²⁶ = 2056670617 is a prime.

It is a super-2 number, since 2×2123779481² = 9020878567833258722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2123779421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061889740 + 1061889741.

It is an arithmetic number, because the mean of its divisors is an integer number (1061889741).

Almost surely, 2^2123779481 is an apocalyptic number.

It is an amenable number.

2123779481 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123779481 is an equidigital number, since it uses as much as digits as its factorization.

2123779481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 2123779481 is about 46084.4819977398. The cubic root of 2123779481 is about 1285.3946071670.

The spelling of 2123779481 in words is "two billion, one hundred twenty-three million, seven hundred seventy-nine thousand, four hundred eighty-one".